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Subject: Re: [virtio-dev] Re: [PATCH 0/5] virtio: introduce SUSPEND bit and vq state
I believe we have discussed this for many times, and I even provide you some examples.From: Zhu, Lingshan <lingshan.zhu@intel.com> Sent: Wednesday, September 20, 2023 11:36 AM On 9/19/2023 2:49 AM, Michael S. Tsirkin wrote:On Mon, Sep 18, 2023 at 06:41:55PM +0000, Parav Pandit wrote:Please refer to the code for setting FEATURES_OK.It wont work when one needs to suspend the device. There is no point of doing such work over registers as fundamentalframework is over the AQ.Well not really. It's over admin commands. When these were built the intent always was that it's possible to use admin commands through another interface, other than admin queue. Is there a problem implementing admin commands over a memory BAR? For example, I can see an "admin command" capability pointing at a BAR where commands are supplied, and using a new group type referring to device itself.I am not sure, if a bar cap would be implemented as a proxy for the admin vq based live migration. then the problems of admin vq LM that we have discussed still exist. the bar is only a proxy, doesn't fix anything. and even larger side channel attacking surface: vf-->pf-->vfAQ LM using PF has no side channel attack as hypervisor and owner device is trusted entity as already discussed.
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